From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Mon, 15 May 2017 19:18:13 +0000 (+0200)
Subject: Fixed incorrect call to WriteBlob reported in #490.
X-Git-Tag: 7.0.5-7~12
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f0232a2a45dfd003c1faf6079497895df3ab0ee1;p=imagemagick

Fixed incorrect call to WriteBlob reported in #490.
---

diff --git a/coders/png.c b/coders/png.c
index c194d0858..cfd684400 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -4782,10 +4782,11 @@ static Image *ReadOneJNGImage(MngInfo *mng_info,
           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
             "    Copying JDAT chunk data to color_blob.");
 
-        (void) WriteBlob(color_image,length,chunk);
-
         if (length != 0)
-          chunk=(unsigned char *) RelinquishMagickMemory(chunk);
+          {
+            (void) WriteBlob(color_image,length,chunk);
+            chunk=(unsigned char *) RelinquishMagickMemory(chunk);
+          }
 
         continue;
       }